The quote "To speak behind others' backs is the ventilator of the heart" from Marjane Satrapi's "Embroideries" suggests that discussing others when they are not present can serve as an emotional release or a way to vent feelings. This metaphor implies that such conversations allow individuals to express their hidden thoughts and feelings, perhaps leading to a sense of relief or catharsis. It highlights the human tendency to share opinions and emotions, especially in the context of social settings.

Satrapi’s insights into interpersonal dynamics underscore a common practice in many cultures, where people seek solace or understanding through gossip or conversation about mutual acquaintances. While this behavior is often criticized, it can serve as a way for individuals to bond, share experiences, and process their feelings within a community. However, the quote also hints at the ethical dimensions of such discussions, inviting reflection on the consequences of speaking about others without their knowledge.